Comparison of Multi-year Growth Characteristics of Main Poplar Varieties in Jianghan Plain at Different Densities

doi:10.11924/j.issn.1000-6850.casb2022-0753

Abstract

Abstract:

In order to compare the growth differences of different polar varieties at different densities, the main planting poplar varieties in Jianghan Plain were used as materials. By setting different planting densities, the growth characteristics of the experimental forest were continuously measured for 5 years. The results showed that different varieties had different responses to the planting density with the increase of stand age. At the density of 278 ind/hm², the tree height of ‘Zhonglin 2025’ showed a significant advantage compared with that at other densities. However, other varieties had no significant difference in tree height at different densities with the increase of stand age. Different densities had great influence on the diameter at breast height (DBH) of the four main planting poplar varieties, and showed significant differences in the second year of afforestation. From the perspective of large diameter timber cultivation, the planting density for ‘Zhonglin 2025’ and ‘Danhong’ should be less than 278 ind/hm², and the planting density for ‘Chulin 2’ and ‘Huashi 2’ should be below 333 ind/hm². After 3 years of afforestation, the accumulation of ‘Zhonglin 2025’ at the density of 278 ind/hm² exceeded that of other densities. For other varieties, the higher the density, the greater the accumulation. But with the increase of stand age, the difference of the accumulation of different varieties was narrowed. Comparing the growth characteristics of 5-year-old stands at different densities, it could be seen that the differences among different varieties and different densities reached a significant level. On the whole, in Jianghan Plain, ‘Danhong’ and ‘Huashi 2’ have greater promotion and utilization value than ‘Zhonglin 2025’ and ‘Chulin 2’. ‘Zhonglin 2025’ is not suitable for dense planting, and other three varieties can be planted at a density of 833 ind/hm² within 5 years, followed by adjusting the density and gradually thinning, in order to meet the needs of tree growth and quality improvement, and get high benefit.

Key words: Jianghan Plain, poplar, densities, multi-year, growth characteristics

HUANG Guowei, ZHANG Xinye, MA Linjiang, LIU Hua, FAN Xiaoping, LONG Kailian, YAO Jingkui. Comparison of Multi-year Growth Characteristics of Main Poplar Varieties in Jianghan Plain at Different Densities[J]. Chinese Agricultural Science Bulletin, 2023, 39(29): 24-31.

Figures/Tables 6

References 25

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性状	变异来源	平方和	df	均方	F值	显著性
胸径	组间	10331.058	19	543.740	85.875	0.000
	组内	3944.691	623	6.332
	总数	14275.748	642
树高	组间	4621.504	19	243.237	60.543	0.000
	组内	2502.972	623	4.018
	总数	7124.476	642
单株材积	组间	9.507	19	0.500	82.921	0.000
	组内	3.759	623	0.006
	总数	13.266	642
蓄积量	组间	1076433.971	19	56654.420	41.264	0.000
	组内	855372.252	623	1372.989
	总数	1931806.224	642

性状	变异来源	平方和	df	均方	F值	显著性
胸径	组间	10331.058	19	543.740	85.875	0.000
	组内	3944.691	623	6.332
	总数	14275.748	642
树高	组间	4621.504	19	243.237	60.543	0.000
	组内	2502.972	623	4.018
	总数	7124.476	642
单株材积	组间	9.507	19	0.500	82.921	0.000
	组内	3.759	623	0.006
	总数	13.266	642
蓄积量	组间	1076433.971	19	56654.420	41.264	0.000
	组内	855372.252	623	1372.989
	总数	1931806.224	642

品种与密度	胸径/cm	树高/m	单株材积/m³	蓄积量/(m³/hm²)
中林2025杨（833株/hm²）	12.55±2.19a	15.06±2.22a	0.08±0.04a	68.86±34.53bcd
中林2025杨（556株/hm²）	14.61±2.71b	15.87±2.47a	0.11±0.05ab	63.79±29.84abc
中林2025杨（417株/hm²）	14.46±2.09b	16.04±2.15a	0.11±0.04ab	46.39±16.83a
中林2025杨（333株/hm²）	17.57±2.46cd	17.21±1.77b	0.17±0.05c	55.42±16.78ab
中林2025杨（278株/hm²）	21.15±3ef	21.1±2.03d	0.29±0.11f	81.2±29.68cde
楚林2号杨（833株/hm²）	15.55±3.2b	18.09±2.69b	0.15±0.07bc	125.39±58.1g
楚林2号杨（556株/hm²）	17.12±1.92c	19.58±1.53c	0.18±0.05cd	102.15±25.53f
楚林2号杨（417株/hm²）	18.84±1.66d	20.83±1.36d	0.23±0.05e	96.65±19.37ef
楚林2号杨（333株/hm²）	20.89±1.37ef	21.66±1.8de	0.29±0.05f	95.84±15.4ef
楚林2号杨（278株/hm²）	21.34±2.4ef	21.98±1.61de	0.31±0.07fg	85.45±20.4def
丹红杨（833株/hm²）	18.03±3.37cd	19.77±2.92c	0.21±0.09de	177.37±74.8k
丹红杨（556株/hm²）	20.25±2.73e	21.9±1.77de	0.28±0.08f	157.38±46.11ij
丹红杨（417株/hm²）	21.34±2.2ef	21.5±1.76de	0.3±0.07fg	124.71±30.88g
丹红杨（333株/hm²）	24.23±2.91g	23.22±1.67fg	0.41±0.1i	136.13±34.34gh
丹红杨（278株/hm²）	27.22±2i	23.87±1.79g	0.51±0.1k	141.27±27.37ghi
华石2号杨（833株/hm²）	17.93±3.81cd	19.41±2.94c	0.21±0.1de	174.78±85.58jk
华石2号杨（556株/hm²）	22.13±2.85f	22.43±1.88ef	0.34±0.1gh	187.2±53.22k
华石2号杨（417株/hm²）	23.41±2.29g	21.89±1.63de	0.36±0.07h	148.18±29.63hi
华石2号杨（333株/hm²）	25.73±2.33h	23.54±2.23g	0.45±0.09j	151.23±29.78hi
华石2号杨（278株/hm²）	26.15±2.8hi	23.9±1.99g	0.48±0.11jk	133.32±30.28gh

品种与密度	胸径/cm	树高/m	单株材积/m³	蓄积量/(m³/hm²)
中林2025杨（833株/hm²）	12.55±2.19a	15.06±2.22a	0.08±0.04a	68.86±34.53bcd
中林2025杨（556株/hm²）	14.61±2.71b	15.87±2.47a	0.11±0.05ab	63.79±29.84abc
中林2025杨（417株/hm²）	14.46±2.09b	16.04±2.15a	0.11±0.04ab	46.39±16.83a
中林2025杨（333株/hm²）	17.57±2.46cd	17.21±1.77b	0.17±0.05c	55.42±16.78ab
中林2025杨（278株/hm²）	21.15±3ef	21.1±2.03d	0.29±0.11f	81.2±29.68cde
楚林2号杨（833株/hm²）	15.55±3.2b	18.09±2.69b	0.15±0.07bc	125.39±58.1g
楚林2号杨（556株/hm²）	17.12±1.92c	19.58±1.53c	0.18±0.05cd	102.15±25.53f
楚林2号杨（417株/hm²）	18.84±1.66d	20.83±1.36d	0.23±0.05e	96.65±19.37ef
楚林2号杨（333株/hm²）	20.89±1.37ef	21.66±1.8de	0.29±0.05f	95.84±15.4ef
楚林2号杨（278株/hm²）	21.34±2.4ef	21.98±1.61de	0.31±0.07fg	85.45±20.4def
丹红杨（833株/hm²）	18.03±3.37cd	19.77±2.92c	0.21±0.09de	177.37±74.8k
丹红杨（556株/hm²）	20.25±2.73e	21.9±1.77de	0.28±0.08f	157.38±46.11ij
丹红杨（417株/hm²）	21.34±2.2ef	21.5±1.76de	0.3±0.07fg	124.71±30.88g
丹红杨（333株/hm²）	24.23±2.91g	23.22±1.67fg	0.41±0.1i	136.13±34.34gh
丹红杨（278株/hm²）	27.22±2i	23.87±1.79g	0.51±0.1k	141.27±27.37ghi
华石2号杨（833株/hm²）	17.93±3.81cd	19.41±2.94c	0.21±0.1de	174.78±85.58jk
华石2号杨（556株/hm²）	22.13±2.85f	22.43±1.88ef	0.34±0.1gh	187.2±53.22k
华石2号杨（417株/hm²）	23.41±2.29g	21.89±1.63de	0.36±0.07h	148.18±29.63hi
华石2号杨（333株/hm²）	25.73±2.33h	23.54±2.23g	0.45±0.09j	151.23±29.78hi
华石2号杨（278株/hm²）	26.15±2.8hi	23.9±1.99g	0.48±0.11jk	133.32±30.28gh